Wednesday, AOL’s Bebo social network added a new tool to its string of features, called “Social Inbox,” which aggregates a user’s friends’ activities from their online social life, irrespectively of the network the latter have chosen to work with.

Social networking websites like Facebook and FriendFeed can also add feeds from other similar services, but Bebo does that without asking a user’s friends to join the network so that the former can check out what they’ve been up to lately.

Bebo’s “Social Inbox” feature allows you to see updates from people you are connected to via any service, by aggregating them into your inbox on the site. All you need to do is provide the service with your user ID on all the other websites you are a member of and Bebo will make sure you know what your friends are doing.

Nevertheless, some of the features for the aggregation tool are scheduled to become available only in January 2009.

Bebo will also offer the aggregation feature for e-mail inboxes from several services a person is using, along with an embedded instant messaging function that works via the AOL Instant Messenger (AIM) network.

Still, the tool is currently unable to integrate friends of a user who are not on his or her buddy list on AIM, a feature that is yet to be worked out by AOL.

In addition, Bebo will keep you posted on what content and media links your friends are sharing, as well as enabling you to comment on the feeds it gathers from other services.