In my opinion, they should not be task based. If you can give a task, give it in a written form. If there are details you need to specify which cannot be provided in a written form, or if you require feed-back, do call. But most task-based phone calls should rather be emails.
I am a Digital Marketing Manager for The KPI Institute. My expertise is in SEO (Search Engine Optimization) / UX (user experience) / WordPress. Co-founder of lumeaseoppc.ro (series of events on SEO & PPC) and cetd.ro (Book on branding for MDs). On a personal level, I like self-development - events, sports, healthy living, volunteering, reading, watching movies, listening to music.
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