Spaces are simply a place to talk about whatever that space is dedicated to, localized discussions that can be followed or unfollowed to show on your feed or not.
If you want to place ads, use the hashtags #ads etc. Click channels at the top of every page to see some popular ones. Just write an update right in your own profile, and the use of hashtags will distribute it across the site to everyone following that hashtag.
In South side pittsburgh with a group of guys for a bachelor party. Looking for a girl or 2 to come over for a fun night. Possibly Friday but I'd say Saturday would be better. Text me 44036001ate5. In town from cleveland