Can someone know if you search for them on Spokeo?

No, individuals can generally browse Spokeo without alerting the people they search for. Spokeo does not notify users of who is looking at their profiles or conducting searches on them. It's a privacy measure to ensure that searches remain confidential. However, if someone purchases a Spokeo subscription or a one-time report about another individual, payment methods and possibly subscriber information are collected by Spokeo but not disclosed to the subjects of the reports.