I'm doing a dissertation proposal on 'Social media as a marketing tool for women' Can anyone help?

[john]

In general you do not need more than a single aim but you will need to set several objectives - perhaps at least 4. First of all you need to narrow down the topic "Social media as a marketing tool for women" is very broad. What is the context? Who are these women? Are they business owners, strippers, women seeking men?

So for example your aim could be "To evaluate the impact of social media as a marketing tool among women business owners in the UK cosmetic industry". In this way you are pinning down your research to a specific area that you want to shed more light on - perhaps because there is limited research in that area.

Objectives:
To highlight the growing trend in using social media in business marketing
To identify the main drivers for the increase growth in using social media as a business marketing tool
etc.

Narrow the topic down first then you can set your objectives.