The best replacement for facebook connect is openid.

The best alternatives to facebook connect are rated as following:

★★★★★	openid
★★★★	open graph
★★★	graph api
★★	opensocial
★★	facebook application

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Speaking about facebook connect, one probably shouldn't forget about mig33.

Other search terms related to facebook connect and their ratings are:

★★★★★	mig33
★	login

You have in mind a companion for facebook connect and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of facebook connect in all years. Click on graph for more.

facebook connect

openid

open graph