By Erik SkindrudMARIPOSA GAZETTE
Twitter accounts for Yosemite National Park, the Mariposa County Arts Council and the Mariposa Gazette were hijacked on Wednesday, with junk messages sent to account followers.
Without doing a complicated and expensive investigation, it's hard to know who is responsible, said Mike Bird, a computer consultant with Iron Mountain Systems.
The most important thing for computer users to remember is not to open any unsolicited attachment in any email.
"If someone sends you a joke or card, the safest thing to do is not to open it," Bird said.
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