The hashtags point out Strange and Tony Stark's similar facial hair, as well as the fact that both actors have played Sherlock Holmes; one on film and the other on BBC.
"Infinity War" is going to be one packed film when it comes to Marvel characters. "I think at one point, 61 or 62 Marvel characters in it," Scarlett Johnansson told Stephen Colbert earlier this month. "Yeah, there's a lot ... I think in one particular scene there's like 32 of us. There's a lot."
In addition to the stars above, Chris Hemsworth, Chris Evans, Jeremy Renner, Paul Bettany, Elizabeth Olsen, Don Cheadle, Josh Brolin, Samuel L. Jackson, Chris Pratt, Zoe Saldana, Dave Bautista, Karen Gillan, Bradley Cooper, Vin Diesel, Chadwick Boseman, Anthony Mackie, Sebastian Stan, Tom Holland and Paul Russ are all expected -- but not all confirmed -- to appear in the film.
"Avengers: Infinity War" hits theaters May 4, 2018.