The number 150 represents about how many emotional connections a person can have. A person can memorize the names and faces in the thousands (citation needed and the human brain is quite remarkable), but to actually be aware of and to personally know others on an emotional/deep level is limited.
So, to put in my 2 cents, 150 people that you actually know, and however many movie stars, pop stars, business folk, and whoever else depending on how well your memory functions (improved with use of a memory palace, i.e. method of loci).