When you create a connection, you set an affinity with it: that means you decide the degree of friendship or acquaintance you want to have with this channel.
By default, this is set to All. If you want to change it, go on the connection page by clicking on the connection icon
On connection that you want to modify, click on Edit
Then, click on Set Affinity & Profile.
The slider appears : select the degree of friendship you want to set with the connection. Think of this as a measure of how much you like or dislike it and how much you want to see this connection's posts.
Even if you see Me, Family, Friends, you can set the slider anywhere between 1 (for people you like) and 99 (for people you don't care for). Don't forget to Submit.
Warning: affinity has no relation to permissions.
Once you've assigned a value to your connection, you can use the affinity tool on the network page to filter content based on the affinity level you set.
Moving the slider from Me to All allows you to filter what you see on the network page: posts will only be shown from people who fall between this range.
For example, setting the affinity tool slider to friends will allow you to see only the posts from your connections with an affinity set to friend.
Go to the Settings and to the Additional features tab. Click on Network and Stream Filtering. Set Affinity Tool to on. Don't forget to Submit.
You can filter exactly what you want to appear or not in your activity stream. You do this by editing the connection and select the Custom Filter tab. In here you can set filters on what you want to appear and/or filters on what you don't want to appear
For example you can filter:
Setting filters means that from now on the activity stream will be filtered. Already streamed posts will still be there and also future comments on those posts will be streamed.