">The key used by Session to store the user's id value in the Bundle during
 load and save.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../constant-values.html#com.facebook.TokenCachingStrategy.USER_FBID_KEY">Constant Field Values</a></dd></dl>
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<h4>TOKEN_SOURCE_KEY</h4>
<pre>public static final&nbsp;<a href="http://d.android.com/reference/java/lang/String.html?is-external=true" t