labmeeting.com

What a rigmarole to signup to labmeeting.com. I had to send them a link to my webpage and then they asked me to put a link to labmeeting on my webpage and finally they let me sign up. It took 4 days!
If Mendeley took had the same strategy they wouldn't have 22,607 users with 2,723,657 articles. Couldn't find any stats for labmeeting.com
Pdf data extraction was just as bad in Labmeeting as in Mendeley. In labmeeting you can't provide a doi lookup.

last.fm versus spotify

Last.fm suggests music that you might not have already heard off. Spotify relies on the fact that you know what you want to listen to.
You can find everything on Spotify, the tracks are a lot less extensive on last.fm, especially for classical music.
Spotify has ads in the free version.

Mendeley is getting better day by day.

Unlike some cynics, I think Mendeley is the bees knees! I am currently collaborating on two separate projects and sharing the references thanks to Mendeley couldn't be easier. Now it is even better, with integrated pdf viewer and the ability to highlight and make notes directly on the pdf.
I am sold, I really think it is the best reference manager social networking tool out there.