Monday Odds and Ends

By Erik Oster 

-Citrix ShareFile spread some holiday cheer with “Call Center Caroling” (video above).

AdAge examines the top ads of the year by estimated spending.

CMO Today picks “Five Advertising Execs to Watch in 2015.”

-American Express was able to generate 10 million Instagram impressions by utilizing guest photographers in a two-week campaign.

-“The Media Guy” picks the year’s best media feuds.

-Shake Shack announced it is going public.