Signing up for the free "Standard Membership" give you the ability to view most areas of the site with limited interaction.
The major feature of this level is the ability to create your profile; add, delete, and edit your own post; add friends and follow others. For additional information on Features access click on Membership on the main menu.
Free 30 day Trials are available to experience additional features to find the membership that fits you needs.
Remember if you give personal information to a large corporation for free services you just paid for the services... so it isn't free after all.