While I don't have the same issues that some of the hobbyists have with SO's since I am single but I don't mind an occasional pm if one of my ATF's is running a special or comes back to town or something of that matter but out of the blue texts or especially calls IMHO are unacceptable. Before I started hobbying I had this dancer that I saw once outside of the gentleman's club start blowing up my phone every couple of weeks wanting to know when I was going to see her again . All I could tell her was I don't know I am busy at work I will let you know. After a couple of times she finally got the hint. Then out of the blue she calls again this time with a different phone number I finally had to tell her don't call me I will call you!!
So in conclusion:
PM's OK (just don't expect a response)
Phone calls and Text not OK
Just my: