Useful icons?

Judging by the example one shown in the pic, John Doe was a family man living in the US, who carried a shield, either spent most of his time leaning forwards at an improbable angle or once put his foot through a staircase. He also apparently banged wooden stakes into things with his bare fists? and, had some form of nuclear-based super powers?

Or...

Or you could just have important stuff like your name and the relevant dates carved onto the tombstone.

Mind you if the chip could say "Eff off Time team, Baldrick eff off!" maybe they're onto a winner.

Research...?

What a strange choice of name... The Rosetta stone is famous for giving us the ability to translate Egyptian hieroglyphs, not for containing any directly useful content. I guess it just sounded cool.

Then again, thinking forward a few hundred years, maybe the name is a good choice, it took years to work out how to read the Rosetta stone!

Pity the EMP from the first shots of WWIII will fry the little chip.

Possibly useful, if...

... the technology lasts and can store enough data for an instant website right there, no further networking required. I mean, seriously, that would be obviously useful... as long as the technology lasts. As for duration, well, most graves here don't seem to last more than fifty years. But Western Europe is a lot more crowded than North America.

Rick Roll

'the tags can use induced current to respond with a URL where the owner, or the owner's heirs, have uploaded personal information about the deceased'

.... or Rick Roll from beyond the grave!!!

Nuclear powered grave stone?

Hmm gravestone equipped with a holographic projector, where the deceased could leave a video about themselves and their experiences would be interesting and useful for ancestral research purposes. Also a message of "Stop standing on me!!" to stop people walking on graves would be quite useful too.

Only issue would be powering it, solar would get dirty too quick and struggle to provide the energy, nuclear.....could be a goer, plus fringe benefits of supplying any excess to the grid, post death carbon footprint reduction? ;-) Of course the average UK "man / woman on the street" would freak about "killer nukes irradiating our dearly departed"