(WSJ) - Social media can offer oenophiles tasting notes, industry news and a bit of fun—as well as egregious displays of trophy bottles and interminable video tutorials. Lettie Teague finds the feeds worth following.

WHEN MUCH-LOVED Manhattan wine merchant Jean-Luc Le Dû passed away in his sleep a few weeks ago, social media channels were flooded with expressions of grief. Twitter,Instagram and Facebook users posted photos, poetic tributes, even playlists in honor of Mr. Le Dû. His friend Yannick Benjamin, who posted the news, said, “Social media was the fastest way of getting the word out.”

It was a poignant example of how the worlds of wine and social media meet, but the two intersect in more quotidian ways as well.