No you don't need to worry, it just means that developers @ Stackoverflow will have to change their code a little bit but it should work fine.
EDIT:
You have to change your code from OpenID to OAuth 2 use http://developers.google.com/accounts/docs/OAuth2WebServer with a minimal scope developers.google.com/+/api/oauth#login-scopes which is profile and from that profile you can determine which user is that and log them in
You don't have to save the token returned because you won't be needing it again until the next login which you will be automatically handed the new or same token by Goole
My Advice is to use the ID can be found using this document
{
"kind": "plus#person",
"etag": "\"RqKWnRU4WW46-6W3rWhLR9iFZQM/hGBwxYeYt07li9hNmxa2J7GE_0c\"",
"nickname": "GreYFoX",
"occupation": "Computer Engineer",
"skills": "iOS Developement, Android Developement",
"birthday": "0000-09-20",
"gender": "male",
"emails": [
{
"value": "@#^$%@^#@gmail.com",
"type": "account"
}
],
"urls": [
{
"value": "http://www.myspace.com/Shereef",
"type": "otherProfile",
"label": "Shereef"
},
{
"value": "http://Shereefz.spaces.live.com",
"type": "otherProfile",
"label": "shereefz"
},
{
"value": "http://www.plaxo.com/profile/showPublic/Shereef",
"type": "otherProfile",
"label": "shereef"
},
{
"value": "http://cid-c74ed9e76d675051.profile.live.com",
"type": "otherProfile",
"label": "@&#$%&@#%^$@live.com"
},
{
"value": "http://www.plaxo.com/profile/showPublic/null",
"type": "otherProfile",
"label": "null"
},
{
"value": "http://pulse.yahoo.com/_VMZ2QYN3AWG57HS5IUW4T2KHRM",
"type": "otherProfile",
"label": "Shereef Marzouk"
},
{
"value": "http://about.me/Shereef",
"type": "otherProfile",
"label": "About.me"
},
{
"value": "http://www.youtube.com/user/Shereefz",
"type": "otherProfile",
"label": "Shereef Marzouk"
},
{
"value": "http://www.youtube.com/user/Shereefz",
"type": "otherProfile",
"label": "Shereef Marzouk"
},
{
"value": "http://www.myspace.com/Shereef",
"type": "otherProfile",
"label": "Shereef"
},
{
"value": "http://Shereefz.spaces.live.com",
"type": "otherProfile",
"label": "shereefz"
},
{
"value": "http://profiles.google.com/17F648F7-5C7D-42D4-A40F-CAC12280C712",
"type": "otherProfile",
"label": "SheefoPad"
},
{
"value": "http://www.youtube.com/user/Shereefz",
"type": "otherProfile",
"label": "Shereef Marzouk"
},
{
"value": "http://Shereefz.spaces.live.com",
"type": "otherProfile",
"label": "shereefz"
},
{
"value": "http://www.myspace.com/Shereef",
"type": "otherProfile",
"label": "Shereef"
},
{
"value": "http://profiles.google.com/17F648F7-5C7D-42D4-A40F-CAC12280C712",
"type": "otherProfile",
"label": "SheefoPad"
},
{
"value": "https://profiles.google.com/104183538590490028018/buzz",
"type": "contributor",
"label": "Buzz"
},
{
"value": "https://developers.google.com/groups/chapter/103706763079402130148/",
"type": "contributor",
"label": "GDG Alexandria (Google Developers Group Alexandria)"
},
{
"value": "http://www.shereef.net",
"type": "contributor",
"label": "Shereef"
},
{
"value": "http://shereef.net/resume",
"type": "other",
"label": "Resume"
},
{
"value": "http://shereef.net/blog",
"type": "other",
"label": "Blogger"
},
{
"value": "http://about.me/shereef",
"type": "other",
"label": "About.me"
},
{
"value": "http://pulse.yahoo.com/sheefoz",
"type": "other",
"label": "sheefoz"
},
{
"value": "http://facebook.com/Shereefz",
"type": "other",
"label": "shereefz"
},
{
"value": "http://www.linkedin.com/in/shereef",
"type": "other",
"label": "shereef"
}
],
"objectType": "person",
"id": "104183538590490028018",
"displayName": "Shereef Marzouk",
"name": {
"familyName": "Marzouk",
"givenName": "Shereef"
},
"tagline": "Senior Mobile Developer / Team lead at X Digital Group",
"braggingRights": "XDG Hero",
"aboutMe": "<span>Shereef Marzouk is an Egyptian mobile applications developer who enjoys his work very much, with many years of experience of development in mobile and general development, Shereef also loves helping people and love sharing, He also develops free-lance applications under his personal company name Tools Era (ToolsEra), Shereef is an Egyptian with his own cultural views and politic, Shereef is not your typical Egyptian nor Developer.</span>",
"relationshipStatus": "engaged",
"url": "https://plus.google.com/+ShereefMarzouk",
"image": {
"url": "https://lh3.googleusercontent.com/-P9UMptk6e5U/AAAAAAAAAAI/AAAAAAAFzp0/v3ArGL-l8Tg/photo.jpg?sz=50",
"isDefault": false
},
"organizations": [
{
"name": "Alexandria Higher Institute of Engineering and Technology",
"title": "Computer Engineering",
"type": "school",
"startDate": "2005",
"endDate": "2011",
"primary": false
},
{
"name": "English Lycee Liberity",
"title": "School",
"type": "school",
"startDate": "1994",
"endDate": "2004",
"primary": false
},
{
"name": "Sidi Gaber Language School",
"title": "K.G.",
"type": "school",
"startDate": "1992",
"endDate": "1994",
"primary": false
},
{
"name": "X Digital Group",
"title": "Senior Mobile Developer / Team Lead",
"type": "work",
"startDate": "2012",
"primary": true
},
{
"name": "X Digital Group",
"title": "Interactive Touch Screen and Mobile Core Developer",
"type": "work",
"startDate": "2012",
"endDate": "2013",
"primary": false
},
{
"name": "Health-Insights",
"title": "Android / iOS / C#.NET Developer",
"type": "work",
"startDate": "2011",
"endDate": "2012",
"primary": false
}
],
"placesLived": [
{
"value": "Alexandria, Egypt",
"primary": true
},
{
"value": "KSA"
},
{
"value": "Lybia"
},
{
"value": "Egypt"
},
{
"value": "Qatar"
}
],
"isPlusUser": true,
"language": "en",
"ageRange": {
"min": 21
},
"circledByCount": 707,
"verified": false,
"cover": {
"layout": "banner",
"coverPhoto": {
"url": "https://lh3.googleusercontent.com/-kp8ALVVOa1o/U-Bo2sjE9GI/AAAAAAAFkaA/PWKY2q2e9lY/s630-fcrop64=1,0000208effb2f94e/_MG_0344-SMILE.jpg",
"height": 626,
"width": 940
},
"coverInfo": {
"topImageOffset": -294,
"leftImageOffset": 0
}
}
}
search for "id": "104183538590490028018" in the json i pasted here
P.S. Open all links in this answer because they will benefit you.
Also remember when requesting profile to use the id as me because you won't have the logging in user profile
