com.google.android.gms.analytics.samples.mobileplayground has things like this in its AndroidManifest.xml:
<activity android:name=".EventFragment"
android:label="@string/app_name"></activity>
Fragments in the manifest. That used to be a no-no, though it is being done now, apparently.
The Android docs are a vast maze of sometimes contradictory information, where can I get some reference (like this) - purpose, possibilities, limitations, etc?
[edit] Irritating that to disprove legit usage of Fragments in this way, we need someone of authority (google dev or someone very up-to-date on what they churn out), anyone else would just be guessing.