PM list is nothing but the a collection off members you send your PMs too, when you update. You don't need to necessarily befriend all of them. You can send individual PMs too, just thatbit is more time consuming!
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Can you make a specific group? Like if you're going to constantly send PMs to these 10 people, you can just click that group and it would send it to those 10 people automatically?
when u send a message u have the option to choose the friends from all the list of friends...so u can check it out yaar...try sending a message after making friends...but otherwise making specific groups and adding them in it...thats not possible...when u have option to choose then there will automatically be no problem...hope it helped