A modern day CLASSIC from Ms. Burnikel today. With its central cross of TWITTERALERTS and FRIENDREQUEST, the "new-to-me" BITMOJIS (10D: Cartoon avatars on Snapchat), and the answers LATTEART (13A: Pouring one's heart out at a coffeehouse?) and EPICWINS (29A: Awesome successes), this had a real contemporary LUSTRE.
Keeping it real, on the other hand, were such throwbacks as KOJAK (27A: Lieutenant of 1970s TV), SHA (45A: 1950s song syllable), and ROSEANNE (32D: Show for which Laurie Metcalf won three Emmys), although I hear that last one is coming back. I used to watch - and enjoy - the show when it was first on, and if I can figure out when the reboot is happening, I might just tune in.
I couldn't help myself with the two pictures today. Don't you just always think of Looney Tunes when you hear ALUM mentioned? Who knew it was also sometimes used as an "8D: Application to a cut?"
1A: Time-tested (CLASSIC) - B+. It's perfectly acceptable. (And speaking of CLASSIC, it's always surprising to me that VLASIC only has one S.)
Favorite: SICEM (19A: Biting words?) or LANDHO (2D: Shore line?) Sometimes I'm a sucker for a question mark clue.
Least: CROSSE (7D: Sports stick). I played lacrosse in college, and no one ever referred to the stick as a CROSSE. Ever.
There's a lot of good in here, and it was a decent challenge. Thumbs up!