IMO you can never go wrong with taking the high road with this stuff. For me, I always choose to go with less. Pride in your kids is a great thing, but how it materializes sometimes runs the risk of making it more about you/the parent than the kid. I have almost no social media presence which makes it far easier for me. When my son committed, I didn't tweet or retweet. I simply replied to his tweet and said this.
When he did his signing ceremony deal, his school and high school baseball team tweeted out pics of it to which I said and did nothing online. All the pride I expressed was from my mouth to my son and I think that's where it's best left.
When my son was 8ish, I can remember being a loud cheering parent for him at games. That was probably an after effect because I had coached him the 3 years prior where it was uncouth to cheer for him as a coach. But I quickly made a conscious decision to be the quiet parent when it came to MY kid. I always cheered loud and proud for his teammates but never for my son. I left the cheering for my son to personal time between he and I. That way I never ran the risk of being "that" parent. As a bonus, it's actually really cool to stay quiet when your kid does something great. When you're quiet, you get to hear everyone else cheer for your kid and I've found that to be far more satisfying than doing so yourself. My daughter is now up to her eyeballs with volleyball and I take the same approach with her, but I made it clear to both my kids that me staying quiet publicly when they succeed is by design and not any indication of a lack of my pride or happiness for them. Just my 2 cents and YMMV.