fun thing about the internet, people lie. it could be them, it could be assistance. back in the day you would write to the fanclub [oh snail mail, how i miss you. lol, showing my age] typically it was a letter typed out by an assistant and printed on paper with autographs copy/pasted on. think how busy celebrities are, now imagine if you personally answer ever message. [granted, if this is an internet celebrity over, say, Chris Evans, i guess you are speaking with them]
i guess a honey jar, or a maybe a friendship spell [like carve their name into a yellow candle and light it] but i'm not sure how well a spell would work on someone you haven't met and don't know where they live would work. you could try it, but just be yourself, try to have a casual conversation. if it goes places, great, if it doesn't, don't loose sleep over it.