BuddyPress.org

1) https://wordpress.org/extend/plugins/wp-email-login/
2) no plugin exists
3) there might be a plugin for this… though I’m not 100% sure.

For #2, you could create a profile field for a user to input their existing blog URL. But this would only be a link to that person’s blog.

I’m guessing you want to import a user’s external blog based solely on the blog URL; this isn’t possible. However, something could be done with a blog’s RSS feed, though like I said before such a plugin doesn’t currently exist (that I’m aware of!).

I can add rss feed but if user don’t give a correct feed URL it screw up everything. That’s the problem I am facing

http://yourdomain.com/wp-admin/admin.php?page=bp-profile-setup (replace yourdomain.com with your domain)

That’s the page where you can add more fields that people can fill out at registration and will appear in the person’s profile.

@profitsbuzz Though this method is not exactly what I wanted, I use java script to fetch RSS feed and then I use the profile field data tag to call in. If we can integrate feed url validation this will work.

I have tried it live on my site. But users don’t usually give their correct feed url. So it show up error message and it spoil the whole page.

@profitsbuzz
What do you want to do with the RSS feed? Pull in the latest posts to the person’s profile?

have a look at @boonebgorges plugin: https://wordpress.org/extend/plugins/bp-external-activity/ and you could modify that to attach to usermeta vs groupmeta