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Full URL is below.

http://www.facebook.com/?campaign_id=153690914645000&keyword=reunite+friends&placement=broad&creative=6648404084&extra_1=3951e84c-b1ec-1fa9-937a-000070227fe3

*This was seen in the Foursquare notification email filter page of Gmail.

Questions for thought

How many people in the US over the age of 13 do not yet have a Facebook account?

Is this still a market big enough for Facebook to place ads against?

Is Facebook finding people who join via Gmail ads to be profitable?

Are they using a lifetime customer value as part of their customer acquisition strategy?

• If so, what is the time frame they are looking at?