1. TRUE so long as the only content is that you've created... and you trust your skills to ensure that you don't create anything that's "compromising security."
2. FALSE because even a "trusted source" can be compromised.
3. TRUE but, taken literally, that means you have to create means to handle (for example) reformatting to preserve the information provided by tags excluded from your definition of "basic."

In any case, your penultimate paragraph references the major challenge: "to program the aggregator to (INSERT: recognize and ) filter out hostile content."

Update: Reformatted last para above; added INSERT