You might think LinkedIn is the only site to keep up with your field, but there's a lot of conversation happening on Facebook, too. Look for Facebook groups that are related to your industry or job to listen in on these conversations and network with other professionals. If you use Facebook often, career-themed groups make keeping up industry trends easy since they will appear right in your news feed. Even if the groups you join don't have many members, or you don't feel like posting yourself, you can still learn a lot by just seeing what others post (and the resulting discussions). Search for your job title or industry on Facebook, then filter the results by hitting the "Groups" tab. Look at group descriptions, how many members they have and if they're closed or public to help you decide which ones to join.