A bunch of services are really good for saving links so that you'll find them again. But they're not so great for telling friends or co-workers about a link.
Mento is for sharing links with friends: Smarter than email overload,
more permanent than IM, and always just one click away.
How does it work?
Mento is a button for your browser and a place for saving your shared links.
Send links to any email address, Facebook friends and Twitter contacts,
and use groups and tags for exchanging links with more people.
Mento works best with Firefox and certainly supports Safari and Internet Explorer, too.