Do iframes still fit the mold of current web standards? The technology is old but I am seeing them resurface - especially with the new youtube embed code being iframes and facebook just allowing custom tabs to be iframes as well.
My question is basically: Are the acceptable?
Have a look at this SO question: Are IFrames (HTML) obsolete?
In short: They are part of the HTML 5 draft and will be sticking around. If used correctly, I think they are acceptable. :)