Strict Email Login
Allow only the user to login only with email, a Open Source Social Network component. It is a modified component by lianglee (structural, ossn-com.php file) but the actions code are a modified OSSN v7.0. The ossn-com.xml was based on the information on OSSN's website.
A fork of: https://github.com/lianglee/EmailLogin (Discontinued, applied to OSSN Core)
Note on the OSSN version requirement
It is possible to install this and make it work on older versions of OSSN, but I cannot gurantee that will work on those versions as I have not reviewed the code of those versions.
If you are brave to try on older versions of OSSN, feel free to change the ossn_com.xml file's requirement lower to meet your needs.
Now 100% working with no problems on OSSN v7.0, Make sure you are using version 1.3 or higher to make sure everything works fine.
Thanks for something new, now this thing I like it.
Note: My inspiration for this comes from a hypothetical situation and hopefully my comment may not cause a debate.
Inspired by: https://www.opensource-socialnetwork.org/discussion/view/2861/users-account-can-easily-be-hacked/
Yes, it is possible for users with very weak passwords but I am not saying that this component is a vulnerability fixer but just a normal component that can be used by OSSN site admins, if they wish to disable logins using the usernames of the user and only allow email address login.