Everybody sees some annoying Facebook posts at times. When a 30 something becomes a parent for the first time they'll start posting hourly updates about their babies activity and then start posting pictures. (Here's babies first step. Here's babies first poopy. Etc). If you have a single person who isn't in a relationship, they'll start talking about their dog's activities and act as if he's people. If it's somebody in a relationship they'll start saying things like "My boyfriend did this and that". All of that is annoying.
The Twitter equivalent to this is when you start taking the whole "What are you doing?" philosophy literally and start posting about every phone call you make, every sandwich you've eaten, and every subsequent bowel movement in colorful detail.
I think Facebook makes it hard because if you friend somebody you sort of feel obligated to continue following people even if they start posting nothing in their feed other than pictures of their child's latest accomplishments. I think one way to solve that would be for Facebook to create an "acquaintance" setting rather than a pure friend relationship where you don't receive the vast majority of their status updates but that's something that Facebook has to solve.
What becomes really annoying though is when a business you like starts posting this kind of garbage. They'll post a bunch of posts that say how great they are and they'll start buying likes at the types of sites listed at Buy Facebook Fans Reviews instead of creating high quality content that people will want to share on their own. I really think that everybody should consider how annoying their posts might before posting them because that would make Facebook and Twitter much nicer for everybody.
On dates, always think before you speak, and on Facebook always think before you post!