By Erik Skindrud
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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